1.	Simplify 1 Simplify the following expression: $$ \left(-4 + 3\right)\left(-6 - -5\right) - {\left(6 + -2\right)}^{2} $$ Correct Answer $$ -15$$ or -15.0000

2.	Simplify 2 Simplify the following expression: $$ 2\times2\times2\frac{1 - 1}{2 + 1} $$ Correct Answer $$ 0$$ or 0.0

3.	Fractions 1 Simplify the following expression: $$ \frac{-6}{2} - \frac{-2}{4} $$ Correct Answer $$ \frac{-5}{2}$$ or -2.5

4.	Fractions 2 Simplify the following expression: $$ \frac{5}{6}\frac{-1}{4} $$ Correct Answer $$ \frac{-5}{24}$$ or -0.20833333333333334

5.	Significant figures 1. Write the following to 3 significant figures: 3448.8084 Correct Answer 3450 or $$3.45\times10^{3}$$ 2. Write the following to 4 significant figures: 285.79427 Correct Answer 285.8 or $$2.858\times10^{2}$$

6.	Standard Form 1. Write the following in standard form to 4 significant digits: 0.00000217444 Correct Answer $$2.174\times10^{-6}$$ 2. Write the following in standard form to 3 significant digits: 0.00504351 Correct Answer $$5.04\times10^{-3}$$

7.	Significant figures 1. Write the following in preferred standard form to 5 significant digits: 0.007275809 Correct Answer $$7.2758\times10^{-3}$$ 2. Write the following in preferred standard form to 5 significant digits: 0.000000803102 Correct Answer $$803.10\times10^{-9}$$

8.	Simplify 2 Simplify the following expression: $$ 2\left(-2 - 4\right) - \left(\frac{1}{-3} + \frac{2}{-3}\right) $$ Correct Answer $$ -11$$ or -11.0000

9.	Simplify 1 Simplify the following expression: $$ \left(-5 - 1\right)\left(5 + -5\right) - {\left(4 - -1\right)}^{2} $$ Correct Answer $$ -25$$ or -25.0000

10.	Simplify 2 Simplify the following expression: $$ \frac{\frac{4}{6} + \frac{-6}{1}}{{\left(6 - 3\right)}^{2}} $$ Correct Answer $$ \frac{-16}{27}$$ or -0.592593